1 | //=====================================================
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2 | // File : action_lu_solve.hh
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3 | // Author : L. Plagne <laurent.plagne@edf.fr)>
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4 | // Copyright (C) EDF R&D, lun sep 30 14:23:19 CEST 2002
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5 | //=====================================================
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6 | //
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7 | // This program is free software; you can redistribute it and/or
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8 | // modify it under the terms of the GNU General Public License
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9 | // as published by the Free Software Foundation; either version 2
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10 | // of the License, or (at your option) any later version.
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11 | //
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12 | // This program is distributed in the hope that it will be useful,
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13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | // GNU General Public License for more details.
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16 | // You should have received a copy of the GNU General Public License
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17 | // along with this program; if not, write to the Free Software
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18 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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19 | //
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20 | #ifndef ACTION_LU_SOLVE
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21 | #define ACTION_LU_SOLVE
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22 | #include "utilities.h"
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23 | #include "STL_interface.hh"
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24 | #include <string>
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25 | #include "init/init_function.hh"
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26 | #include "init/init_vector.hh"
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27 | #include "init/init_matrix.hh"
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28 |
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29 | using namespace std;
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30 |
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31 | template<class Interface>
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32 | class Action_lu_solve
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33 | {
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34 |
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35 | public :
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36 |
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37 | static inline std::string name( void )
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38 | {
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39 | return "lu_solve_"+Interface::name();
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40 | }
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41 |
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42 | static double nb_op_base(int size){
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43 | return 2.0*size*size*size/3.0; // questionable but not really important
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44 | }
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45 |
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46 |
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47 | static double calculate( int nb_calc, int size ) {
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48 |
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49 | // STL matrix and vector initialization
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50 |
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51 | typename Interface::stl_matrix A_stl;
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52 | typename Interface::stl_vector B_stl;
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53 | typename Interface::stl_vector X_stl;
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54 |
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55 | init_matrix<pseudo_random>(A_stl,size);
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56 | init_vector<pseudo_random>(B_stl,size);
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57 | init_vector<null_function>(X_stl,size);
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58 |
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59 | // generic matrix and vector initialization
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60 |
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61 | typename Interface::gene_matrix A;
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62 | typename Interface::gene_vector B;
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63 | typename Interface::gene_vector X;
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64 |
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65 | typename Interface::gene_matrix LU;
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66 |
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67 | Interface::matrix_from_stl(A,A_stl);
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68 | Interface::vector_from_stl(B,B_stl);
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69 | Interface::vector_from_stl(X,X_stl);
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70 | Interface::matrix_from_stl(LU,A_stl);
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71 |
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72 | // local variable :
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73 |
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74 | typename Interface::Pivot_Vector pivot; // pivot vector
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75 | Interface::new_Pivot_Vector(pivot,size);
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76 |
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77 | // timer utilities
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78 |
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79 | Portable_Timer chronos;
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80 |
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81 | // time measurement
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82 |
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83 | chronos.start();
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84 |
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85 | for (int ii=0;ii<nb_calc;ii++){
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86 |
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87 | // LU factorization
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88 | Interface::copy_matrix(A,LU,size);
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89 | Interface::LU_factor(LU,pivot,size);
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90 |
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91 | // LU solve
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92 |
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93 | Interface::LU_solve(LU,pivot,B,X,size);
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94 |
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95 | }
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96 |
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97 | // Time stop
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98 |
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99 | chronos.stop();
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100 |
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101 | double time=chronos.user_time();
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102 |
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103 | // check result :
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104 |
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105 | typename Interface::stl_vector B_new_stl(size);
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106 | Interface::vector_to_stl(X,X_stl);
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107 |
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108 | STL_interface<typename Interface::real_type>::matrix_vector_product(A_stl,X_stl,B_new_stl,size);
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109 |
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110 | typename Interface::real_type error=
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111 | STL_interface<typename Interface::real_type>::norm_diff(B_stl,B_new_stl);
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112 |
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113 | if (error>1.e-5){
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114 | INFOS("WRONG CALCULATION...residual=" << error);
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115 | STL_interface<typename Interface::real_type>::display_vector(B_stl);
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116 | STL_interface<typename Interface::real_type>::display_vector(B_new_stl);
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117 | exit(0);
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118 | }
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119 |
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120 | // deallocation and return time
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121 |
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122 | Interface::free_matrix(A,size);
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123 | Interface::free_vector(B);
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124 | Interface::free_vector(X);
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125 | Interface::free_Pivot_Vector(pivot);
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126 |
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127 | return time;
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128 | }
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129 |
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130 | };
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131 |
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132 |
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133 | #endif
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134 |
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135 |
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136 |
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